1381428144 has 30 divisors (see below), whose sum is σ = 3866080556. Its totient is φ = 460476000.

The previous prime is 1381428133. The next prime is 1381428151. The reversal of 1381428144 is 4418241831.

It is a happy number.

1381428144 is a `hidden beast` number, since 13 + 81 + 428 + 144 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 1381428099 and 1381428108.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4796482 + ... + 4796769.

Almost surely, 2^1381428144 is an apocalyptic number.

It is an amenable number.

1381428144 is an abundant number, since it is smaller than the sum of its proper divisors (2484652412).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1381428144 is a wasteful number, since it uses less digits than its factorization.

1381428144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9593265 (or 9593256 counting only the distinct ones).

The product of its digits is 24576, while the sum is 36.

The square root of 1381428144 is about 37167.5684434696. The cubic root of 1381428144 is about 1113.7202081765.

Adding to 1381428144 its reverse (4418241831), we get a palindrome (5799669975).

The spelling of 1381428144 in words is "one billion, three hundred eighty-one million, four hundred twenty-eight thousand, one hundred forty-four".